Include aspell-en for Travis tests also
Include aspell-en for Travis tests also

Provides English dictionaries. The main `aspell` package recommends this,
rather than depends on it. Travis tests currently pass without it - but we
think it may be required and it maintains parity with our Puppet manifests.

alphagov/rummager,theodi/rummager,alphagov/rummager,theodi/rummager